CN111004988A - Flange surface treatment method - Google Patents

Flange surface treatment method Download PDF

Info

Publication number
CN111004988A
CN111004988A CN201811164287.6A CN201811164287A CN111004988A CN 111004988 A CN111004988 A CN 111004988A CN 201811164287 A CN201811164287 A CN 201811164287A CN 111004988 A CN111004988 A CN 111004988A
Authority
CN
China
Prior art keywords
flange
percent
hours
surface treatment
dried
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811164287.6A
Other languages
Chinese (zh)
Inventor
王振龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yangzhou Longyang Flange Pipe Mfg Co ltd
Original Assignee
Yangzhou Longyang Flange Pipe Mfg Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yangzhou Longyang Flange Pipe Mfg Co ltd filed Critical Yangzhou Longyang Flange Pipe Mfg Co ltd
Priority to CN201811164287.6A priority Critical patent/CN111004988A/en
Publication of CN111004988A publication Critical patent/CN111004988A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06Zinc or cadmium or alloys based thereon
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02Cleaning or pickling metallic material with solutions or molten salts with acid solutions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention relates to a flange surface treatment method. The method comprises the following steps: the method comprises the following steps: placing the flange in a rust removing solution to be soaked for 1.5-2 hours; step two: placing the derusted flange in clear water to clean and dry; step three: soaking the cleaned and dried flange in the plating assistant solution for 2.5-3 hours, and then drying; step four: hot-dipping the dried flange in molten zinc for 4-5 hours; step five: cooling the hot-dip galvanized flange to room temperature, and then cleaning and drying the flange; step six: and polishing and finish machining the cleaned and dried flange to meet the size requirement. The process method is simple, and the corrosion resistance of the flange can be greatly improved by adopting the process method, so that the service life of the flange is greatly prolonged.

Description

Flange surface treatment method
Technical Field
The invention relates to a flange surface treatment method.
Background
A Flange (Flange), also known as a Flange collar or Flange. The flange is a part for connecting the shafts and is used for connecting pipe ends; there are also flanges on the inlet and outlet of the equipment for the connection between two pieces of equipment, such as reducer flanges. The flange connection or flange joint is a detachable connection which is formed by connecting a flange, a gasket and a bolt with each other to form a group of combined sealing structures. The pipeline flange is a flange for piping in a pipeline device, and is used on equipment to be an inlet and outlet flange of the equipment. The flanges are provided with holes, and the two flanges are tightly connected through bolts. The flanges are sealed with gaskets. The flange is divided into a threaded connection (screw thread connection) flange, a welding flange and a clamping flange. The flanges are used in pairs, the low-pressure pipeline can be screwed with the flanges, and the flanges are welded under the pressure of more than four kilograms. And a sealing gasket is arranged between the two flanges and then is fastened by bolts. The flanges of different pressures have different thicknesses and they use different bolts. When the water pump and the valve are connected with a pipeline, the parts of the equipment and equipment are also made into corresponding flange shapes, which are also called flange connection. The connecting parts which are connected by using bolts at the peripheries of two planes and are closed at the same time are generally called flanges, and for example, the connecting parts of the ventilating duct can be called flange parts. However, the connection is only a part of equipment, such as the connection between a flange and a water pump, and the water pump is not easy to be called as a flange part. The small-sized valve can be called as a flange part. Due to the fact that the flange has high requirements on special working environment and corrosion resistance, the flange in the prior art is poor in corrosion resistance and short in service life.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a flange surface treatment method which is simple in process method, can greatly improve the corrosion resistance of a flange and prolongs the service life of the flange.
Therefore, the technical scheme adopted by the invention is as follows:
the method comprises the following steps:
the method comprises the following steps: placing the flange in a rust removing solution to be soaked for 1.5-2 hours;
step two: placing the derusted flange in clear water to clean and dry;
step three: soaking the cleaned and dried flange in the plating assistant solution for 2.5-3 hours, and then drying;
step four: hot-dipping the dried flange in molten zinc for 4-5 hours;
step five: cooling the hot-dip galvanized flange to room temperature, and then cleaning and drying the flange;
step six: and polishing and finish machining the cleaned and dried flange to meet the size requirement.
As a further improvement of the technical scheme, the plating assistant solution comprises zinc ammonium chloride.
As a further improvement of the technical scheme, the main components of the rust removing liquid comprise oxalic acid, sodium dodecyl sulfate, phosphoric acid, hydrochloric acid, fatty alcohol-polyoxyethylene ether, hexamethylenetetramine and water.
As a further improvement of the technical scheme, the rust removing liquid comprises the following components in percentage by weight: 0.5 to 0.6 percent of oxalic acid, 0.4 to 0.5 percent of sodium dodecyl sulfate, 2.2 to 2.5 percent of phosphoric acid, 50 to 55 percent of hydrochloric acid, 0.6 to 0.8 percent of fatty alcohol-polyoxyethylene ether, 0.4 to 0.6 percent of hexamethylenetetramine and 40 to 45 percent of water.
The invention has the advantages that:
the process method is simple, and the corrosion resistance of the flange can be greatly improved by adopting the process method, so that the service life of the flange is greatly prolonged.
Detailed Description
Example 1
A flange surface treatment method comprises the following steps:
the method comprises the following steps: placing the flange in a rust removing solution to be soaked for 1.5 hours;
step two: placing the derusted flange in clear water to clean and dry;
step three: soaking the cleaned and dried flange in the plating assistant solution for 2.5 hours, and then drying;
step four: hot-dipping the dried flange in molten zinc for 4 hours;
step five: cooling the hot-dip galvanized flange to room temperature, and then cleaning and drying the flange;
step six: and polishing and finish machining the cleaned and dried flange to meet the size requirement.
As a further improvement of the technical scheme, the plating assistant solution comprises zinc ammonium chloride.
As a further improvement of the technical scheme, the main components of the rust removing liquid comprise oxalic acid, sodium dodecyl sulfate, phosphoric acid, hydrochloric acid, fatty alcohol-polyoxyethylene ether, hexamethylenetetramine and water.
As a further improvement of the technical scheme, the rust removing liquid comprises the following components in percentage by weight: 0.5 percent of oxalic acid, 0.4 percent of sodium dodecyl sulfate, 2.2 percent of phosphoric acid, 50 percent of hydrochloric acid, 0.6 percent of fatty alcohol-polyoxyethylene ether, 0.4 percent of hexamethylenetetramine and 40 percent of water.
Example 2
A flange surface treatment method comprises the following steps:
the method comprises the following steps: placing the flange in a derusting solution to be soaked for 2 hours;
step two: placing the derusted flange in clear water to clean and dry;
step three: soaking the cleaned and dried flange in the plating assistant solution for 3 hours, and then drying;
step four: hot dipping the dried flange in molten zinc for 5 hours;
step five: cooling the hot-dip galvanized flange to room temperature, and then cleaning and drying the flange;
step six: and polishing and finish machining the cleaned and dried flange to meet the size requirement.
As a further improvement of the technical scheme, the plating assistant solution comprises zinc ammonium chloride.
As a further improvement of the technical scheme, the main components of the rust removing liquid comprise oxalic acid, sodium dodecyl sulfate, phosphoric acid, hydrochloric acid, fatty alcohol-polyoxyethylene ether, hexamethylenetetramine and water.
As a further improvement of the technical scheme, the rust removing liquid comprises the following components in percentage by weight: 0.6% of oxalic acid, 0.5% of sodium dodecyl sulfate, 2.5% of phosphoric acid, 55% of hydrochloric acid, 0.8% of fatty alcohol-polyoxyethylene ether, 0.6% of hexamethylenetetramine and 45% of water.

Claims (4)

1. A flange surface treatment method is characterized by comprising the following steps:
the method comprises the following steps: placing the flange in a rust removing solution to be soaked for 1.5-2 hours;
step two: placing the derusted flange in clear water to clean and dry;
step three: soaking the cleaned and dried flange in the plating assistant solution for 2.5-3 hours, and then drying;
step four: hot-dipping the dried flange in molten zinc for 4-5 hours;
step five: cooling the hot-dip galvanized flange to room temperature, and then cleaning and drying the flange;
step six: and polishing and finish machining the cleaned and dried flange to meet the size requirement.
2. A flange surface treatment method according to claim 1, wherein the component of the plating assistant solution is zinc ammonium chloride.
3. A flange surface treatment method according to claim 1, wherein the rust removing liquid mainly comprises oxalic acid, sodium dodecyl sulfate, phosphoric acid, hydrochloric acid, fatty alcohol-polyoxyethylene ether, hexamethylenetetramine and water.
4. A flange surface treatment method according to claim 3, wherein the rust removing liquid comprises the following components in percentage by weight: 0.5 to 0.6 percent of oxalic acid, 0.4 to 0.5 percent of sodium dodecyl sulfate, 2.2 to 2.5 percent of phosphoric acid, 50 to 55 percent of hydrochloric acid, 0.6 to 0.8 percent of fatty alcohol-polyoxyethylene ether, 0.4 to 0.6 percent of hexamethylenetetramine and 40 to 45 percent of water.
CN201811164287.6A 2018-10-05 2018-10-05 Flange surface treatment method Pending CN111004988A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811164287.6A CN111004988A (en) 2018-10-05 2018-10-05 Flange surface treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811164287.6A CN111004988A (en) 2018-10-05 2018-10-05 Flange surface treatment method

Publications (1)

Publication Number Publication Date
CN111004988A true CN111004988A (en) 2020-04-14

Family

ID=70110492

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811164287.6A Pending CN111004988A (en) 2018-10-05 2018-10-05 Flange surface treatment method

Country Status (1)

Country Link
CN (1) CN111004988A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115992336A (en) * 2023-03-22 2023-04-21 张家港广大特材股份有限公司 Surface treatment method of large-caliber flange for wind power

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115992336A (en) * 2023-03-22 2023-04-21 张家港广大特材股份有限公司 Surface treatment method of large-caliber flange for wind power
CN115992336B (en) * 2023-03-22 2023-06-09 张家港广大特材股份有限公司 Surface treatment method of large-caliber flange for wind power

Similar Documents

Publication Publication Date Title
CN104722542A (en) Method and device for circularly flushing carbon steel pipes of refined cooling system
CN107795774B (en) Ship dissimilar metal piping connection corrosion protection structure and construction method
CN114032555A (en) Cleaning process for medium pipeline of continuous casting equipment
CN206990275U (en) A kind of marine ballasting waterpipe probe tube
CN111004988A (en) Flange surface treatment method
CN104191183A (en) Metal composite pipe production method
CN104624575B (en) Method for flushing hydraulic pipe oil through hydraulic power unit equipment
CN209181550U (en) A kind of aixal admission formula condenser
CN105090498A (en) Thermal expansion resistance tooth-shaped graphite spacer for flange
CN104191182A (en) Production method of totally-coated metal composite pipe
CN106523812B (en) A kind of high pressure metal hose and preparation method thereof
CN1011911B (en) Corrosion-resistant method for the outer and inner walls of steel pipe bundle
CN215334904U (en) High-temperature-resistant 705 flange pipe
CN204437530U (en) Steam turbine of thermal power plant in-service condenser tube chemical cleaning joint
CN104327784B (en) Many components high resiliency condenser fluid sealant
CN216477190U (en) Wax-proof coating oil pipe
CN109340502B (en) Method for treating water leakage of water pipeline without stopping water supply
CN202361078U (en) Liquid distributor
CN221258567U (en) Fixing device for main steam pipeline drain pipe
KR20200008452A (en) Corrosion resisting method of metal pipe through passivation process and metal pipe including the same
CN111004969A (en) Novel alloy flange
CN112128730A (en) Cleaning and film forming system for closed water system of thermal power plant and operation method
CN212868868U (en) Corrosion-resistant flange with long service life
CN206409800U (en) A kind of high-pressure-movable bend
CN213271483U (en) Novel flange structure

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20200414